.test_block_one{
  background-color: antiquewhite;
  width: 20vw;
  height: 20vh;
  display: flex;
  backface-visibility: hidden;
}
.test_block_two{
  background-color: aquamarine;
  width: 30vw;
  height: 30vh;
}
.test_block_three{
  background-color: #a5c261;
  width: 50vw;
  height: 50vh;
}
